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The AAL2 of ATM switching system uses the cyclic redundancy check code(CRC) to correct one bit error of the Common Part Sub-layer payload head(CPS-PH). Heavily based on CRC principle, in this paper analyses the process of one bit error correction of the CPS-PH is explored in detail.
Abstract-ATM Adaptation Layer type 1 (AAL1) that can be divided into the Convergence Sublayer (CS) and Segmentation and Reassembly (SAR) sublayers is designed to provide the class A traffic of ATM layer. The AAL1 SAR Protocol Data Unit (PDU) header uses Cyclic Redundancy Check (CRC) and even parity to detect and correct errors. After describing the encoding rules of the CRC and parity-check, this...
With the popularization and development of information technology, digital modulation technology, especially digital phase modulation and quadrature amplitude modulation technologies, is the widely employed digital communications technology. These technologies are more complex, but with the development of digital signal processing and VLSI technology, complex design can be implemented with a small...
The researches on CRC mainly focus on error detection, seldom on the function of error correction. ATM is the core technology of B-ISDN which makes use of cyclic redundancy code to detect and correct the errors. ATM switching system generally adopts CRC to correct a single bit error in the cell header. Based on introducing the essential method of generating CRC, this paper analyses the process of...
There are inevitable errors which are caused by the interference in the channel of ATM transfer system. In order to improve the reliability of information transmission we usually choose cyclic redundancy code to detect the errors in the process of transmission. ATM exchange system adopts the CRC to detect the errors in the cell header. Based on introducing the elementary method of generating CRC,...
In the modern information transmission technology, digital communication has become an important mean. According to today's modern communication technology, the paper studies the principle of QPSK and OQPSK, which is widely used in current communication system. It makes use of Matlab to simulate and verify the performance of QPSK/OQPSK. The results can make compensate for errors caused by the interference...
In this paper we show how to determine the capacity of a TD-CDMA system, for the simplest case of interference due to mobile users within a single cell first. Then we discuss the capacity in multi-cell including uplink and downlink. Smart antenna (SA) technique, combined with joint detection (JD), can improve the system capacity and enhance the system performance markedly. The simulation results of...
Based on both the flat fading and fast fading channels model, this paper analyses the performance of single-input-single-output (SISO) receiver in detail and simulation results shows channel coding contribute to the BER performance of SISO wireless communications system.
This paper introduces the computing method of channel capacity in MIMO Wireless Channel. It mainly analyzes and compares the ergodic capacity of independent and identically distributed (iid) multiple-input multiple-output (MIMO) [1] Rayleigh flat fading channels when channel state information (CSI) is unknown and known to the transmitter but perfectly known at the receiver. Moreover, a computer simulation...
Reflection is one of the three basic factors which impact a mobile communication system. Reflection occurs when the electromagnetic wave meets an object that is much larger than the wavelength of electromagnetic wave. Received power (or its reciprocal, path loss) is generally the most important parameter predicted by large-scale propagation models based on the physics of reflection. We in this paper...
In this paper, the iterative multiuser receiver is explored over the Rayleigh flat fading channel. The work is based on both the turbo principle and parallel interference cancellation (PIC). Together with PIC, the turbo decoder, in view of its powerful error-correction ability, pushes the convergence of the whole receiver. In SIMO system the simulation results show a significant improvement using...
So far almost all the research work on turbo codes focus on primitive turbo code (PTC). In multiple input multiple output (MIMO) system this paper concentrates on the research of non-primitive turbo code (NOPTC) over flat fading channel. It shows that NOPTC outperforms PTC at any size SIR. Thus NOPTC promotes both capacity and reliability of the communications in MIMO system. This paper concludes...
In this paper a multiple-input multiple-output (MIMO) (G.J. Foschini and M.J. Gans, 1998) CDMA system that employs space-time turbo codes is considered to enhance the system capacity. The turbo receiver introduced is able to combat the complicated interference mixture in this system. To evaluate the performance of the turbo receiver this paper focus on the performance analysis on the synchronous flat...
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